Mahabir Singh. (2019). IMO - OLYMPIAD WORK BOOK - 5 (2019-20.). MTG Learning Media.
Chicago-čujuhus (17. p.)Mahabir Singh. IMO - OLYMPIAD WORK BOOK - 5. 2019-20. MTG Learning Media, 2019.
MLA-čujuhus (9. p.)Mahabir Singh. IMO - OLYMPIAD WORK BOOK - 5. 2019-20. MTG Learning Media, 2019.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.